SVG/stroke.html at master · OrangeTreeDev/SVG · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script type="text/javascript" src="jquery-3.1.1.min.js"></script>
    <script type="text/javascript" src="snap.svg-min.js"></script>
    <style type="text/css">
        html, body{
            width: 100%;
            height: 100%;
        }

        svg{
            width: 100%;
            height: 100%;
            background-color: gray;
        }
    </style>
</head>
<body>
<svg id="svg">
</svg>
</body>
</html>
<script type="text/javascript">
    var snap = Snap('#svg');
    var strokeRect = snap.paper.rect({id:'strokeRect',
        x:100,
        y:100,
        width: 200,
        height: 200,
        stroke:'green',
        strokeWidth:4,
        fill:'none'}
    );
    var length = strokeRect.getTotalLength();
    strokeRect.attr({'stroke-dasharray': length,'stroke-dashoffset':length});

    //    动画变换动态添加的属性，必须使用Snap.animate方法
    //    strokeRect.animate({
    //        'stroke-dashoffset':200
    //    }, 2000, mina.easeinout(),function(){
    //        console.log('stroke rectangle is finished! ');
    //    });
    Snap.animate(length, 0, function(val){
        strokeRect.attr({'stroke-dashoffset':val});
    }, 2000, mina.easeinout(), function(){
        console.log('stroking rectangle is done! ');
    });
</script>